Bobs Musings

Packet Tracer is a wonderful development program put out by Cisco: a leader in computer networking hardware. Creating a basic network can be tough going, but it’s necessary in learning in order to qualify for the CCNA certification exam.

Having a networked based on a hub is easy enough- there isn’t any significant configuration. Putting a router in the network is a different story, however, since it will separate networks. Because it does so, any network containing a router will have at least two different network addresses for proper communication. Configuring them is just a matter of assigning the correct addresses and settings.

Constructing the network will take two crossover cables and a console cable. The two crossover cables will connect each desktop to the Ethernet ports of the router, while the console cable will connect one of the computers to the router for configuring. Be sure that the cable you are using isn’t a straight-through when using your Ethernet cable, as this type of cable is reserved for unlike devices.

The IP addresses you assign will be the logic of the operation. It’s up to you which network numbers and addresses you use, but they must follow a certain convention in order to work. You will be using at least four IP addresses total, counting your two desktop machines and two Ethernet ports on the router. Assign each Ethernet port and IP address that corresponds to a certain network. If you assign both to the same network, you will quickly see the configuration won’t work.

The gateway address is also very important: it allows a computer to connect to a network. The gateway address is configured on the desktop, and it’s value is the same IP address as the Ethernet interface that it is connected to. Without the gateway, information wouldn’t have a way of getting from one network to another. It’s one of the most common rookie mistakes to accidentally leave the gateway address blank.

Last, we get to test the network we just created. By sending a packet of data through a ping, we can verify that one computer can contact another computer on a completely different network. From one computer, type in the ping command and the IP address of the separated computer. If the result times out, it means you have either configured the router improperly or have faulty cables. You will find that most often it’s a problem regarding cables and network topology.

In Conclusion

A basic network is easy to setup in theory, but harder to actually create. Confusing Cisco IOS commands and problems such as a faulty cable is enough to give anyone a hard time. Internet tutorials and troubleshooting tactics are a good solution if you have hit a stumbling block.

Learn more about packet tracer tutorial and packet tracer tutorials.